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[PATCH 1/2] memfd: add qemu_memfd_open()
From: |
Marc-André Lureau |
Subject: |
[PATCH 1/2] memfd: add qemu_memfd_open() |
Date: |
Thu, 28 Nov 2019 18:15:17 +0400 |
Refactor qemu_memfd_alloc() to simply return the opened fd.
mmap() can be done later by the caller.
Signed-off-by: Marc-André Lureau <address@hidden>
---
include/qemu/memfd.h | 3 +++
util/memfd.c | 39 +++++++++++++++++++++++++--------------
2 files changed, 28 insertions(+), 14 deletions(-)
diff --git a/include/qemu/memfd.h b/include/qemu/memfd.h
index 975b6bdb77..1642af9459 100644
--- a/include/qemu/memfd.h
+++ b/include/qemu/memfd.h
@@ -44,4 +44,7 @@ void *qemu_memfd_alloc(const char *name, size_t size,
unsigned int seals,
void qemu_memfd_free(void *ptr, size_t size, int fd);
bool qemu_memfd_check(unsigned int flags);
+int qemu_memfd_open(const char *name, size_t size,
+ unsigned int seals, Error **errp);
+
#endif /* QEMU_MEMFD_H */
diff --git a/util/memfd.c b/util/memfd.c
index 4a3c07e0be..523b943b62 100644
--- a/util/memfd.c
+++ b/util/memfd.c
@@ -104,10 +104,9 @@ err:
* memfd with sealing, but may fallback on other methods without
* sealing.
*/
-void *qemu_memfd_alloc(const char *name, size_t size, unsigned int seals,
- int *fd, Error **errp)
+int qemu_memfd_open(const char *name, size_t size, unsigned int seals,
+ Error **errp)
{
- void *ptr;
int mfd = qemu_memfd_create(name, size, false, 0, seals, NULL);
/* some systems have memfd without sealing */
@@ -124,26 +123,38 @@ void *qemu_memfd_alloc(const char *name, size_t size,
unsigned int seals,
unlink(fname);
g_free(fname);
- if (mfd == -1 ||
- ftruncate(mfd, size) == -1) {
- goto err;
+ if (mfd != -1 && ftruncate(mfd, size) == -1) {
+ close(mfd);
+ mfd = -1;
}
}
+ if (mfd == -1) {
+ error_setg_errno(errp, errno, "qemu_memfd_open() failed");
+ }
+
+ return mfd;
+}
+
+void *qemu_memfd_alloc(const char *name, size_t size, unsigned int seals,
+ int *fd, Error **errp)
+{
+ int mfd = qemu_memfd_open(name, size, seals, errp);
+ void *ptr;
+
+ if (mfd == -1) {
+ return NULL;
+ }
+
ptr = mmap(0, size, PROT_READ | PROT_WRITE, MAP_SHARED, mfd, 0);
if (ptr == MAP_FAILED) {
- goto err;
+ error_setg_errno(errp, errno, "failed to allocate shared memory");
+ close(mfd);
+ return NULL;
}
*fd = mfd;
return ptr;
-
-err:
- error_setg_errno(errp, errno, "failed to allocate shared memory");
- if (mfd >= 0) {
- close(mfd);
- }
- return NULL;
}
void qemu_memfd_free(void *ptr, size_t size, int fd)
--
2.24.0
- [PATCH 0/2] RFC: add -mem-shared option, Marc-André Lureau, 2019/11/28
- [PATCH 1/2] memfd: add qemu_memfd_open(),
Marc-André Lureau <=
- [PATCH 2/2] Add -mem-shared option, Marc-André Lureau, 2019/11/28
- Re: [PATCH 2/2] Add -mem-shared option, Eduardo Habkost, 2019/11/28
- Re: [PATCH 2/2] Add -mem-shared option, Igor Mammedov, 2019/11/28
- Re: [PATCH 2/2] Add -mem-shared option, Marc-André Lureau, 2019/11/28
- Re: [PATCH 2/2] Add -mem-shared option, Igor Mammedov, 2019/11/29
- Re: [PATCH 2/2] Add -mem-shared option, Paolo Bonzini, 2019/11/29
- Re: [PATCH 2/2] Add -mem-shared option, Markus Armbruster, 2019/11/29
- Re: [PATCH 2/2] Add -mem-shared option, Eduardo Habkost, 2019/11/29
- Re: [PATCH 2/2] Add -mem-shared option, Igor Mammedov, 2019/11/29
- Re: [PATCH 2/2] Add -mem-shared option, Paolo Bonzini, 2019/11/29